Manchester State Park is a 111-acre (45 ha) state park in Kitsap County, Washington, United States. It is situated on the east side of the Kitsap Peninsula with 3,400 feet (1,000 m) of shoreline facing Puget Sound. It was at one time a harbor defense installation for the nearby Bremerton, then a fuel supply depot and U.S. Navy fire-fighting station. The park contains a former torpedo warehouse, a mining casement, and a gun battery. Park activities include picnicking, camping, boating, fishing, hiking on 1.9 miles (3.1 km) of trails, birdwatching, volleyball, wildlife viewing, and horseshoes.